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Polyp is a asexual form which has a cylindrical body just like hydra whereas the medusa form is sexual form and has an umbrella shape. In case of Aurelia, the adult is sexual form. Males and females are separate and after copulation the female releases eggs which develop into a hydra like structure called ephyra larva which is called polyp form. This larva by budding produces umbrella shaped medusa forms. Thus the asexual polyp form alters with the sexual medusa form. This alternation of generations is called metagenesis.
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What are the two body forms of cnidarians?
The two body forms of cnidarians are the polyp and the medusa. Polyps are typically sessile, tube-shaped organisms attached to a substrate, while medusae are free-swimming, umbrella-shaped organisms.
Which phylum has both medusa and polyp stages in its life cycle?
Cnidaria is the phylum that exhibits both medusa and polyp stages in its life cycle. Medusae are the free-swimming form, while polyps are typically attached to a substrate.
What is a medusoid form?
A medusoid is a Cnidarians:An invertebrate of the phylum Cnidaria (formerly Coelenterata)Coelenterates include the hydra, jellyfishes, sea anemones, and coralsThe medusoid is one of the 2 forms, the other is the polyp.having a saclike body with a single opening (mouth), which occurs in polyp and medusa forms.
Is a free swimming form of a cnidarian called a polyp?
No, a free swimming form of a cnidarian is called a medusa. Polyps are typically attached to a substrate and have a cylindrical body with a mouth surrounded by tentacles at one end. Medusae have a bell-shaped body with tentacles hanging down.
Does a polyp have fluid in it?
No, a polyp is a growth of tissue and does not contain fluid. If there is any fluid associated with a polyp, it is typically due to inflammation or other underlying conditions.
What are the two phases if coelenterates?
The two phases in the life cycle of coelenterates are the polyp stage and the medusa stage. The polyp stage is characterized by a tubular body with tentacles facing upwards, while the medusa stage is characterized by a bell-shaped body with tentacles facing downwards. These two stages alternate in the life cycle of coelenterates.
How do hydras differ from other cnidarians the class Hydrozoa?
Most hydras alternate between an asexual polyp stage and a sexual medusa stage, though the best-known Hydrozoan, Hydra, never becomes a medusa, spending its whole life as a polyp.
What are the two body forms of cnidarians?
The two body forms of cnidarians are the polyp and the medusa. Polyps are typically sessile, tube-shaped organisms attached to a substrate, while medusae are free-swimming, umbrella-shaped organisms.
Which phylum has both medusa and polyp stages in its life cycle?
Cnidaria is the phylum that exhibits both medusa and polyp stages in its life cycle. Medusae are the free-swimming form, while polyps are typically attached to a substrate.
What is the free floating body form of cnidarians?
The free floating body form of cnidarians is called a medusa. Medusae have a bell-shaped body with tentacles hanging down, and they are often seen swimming in the water. Examples include jellyfish and hydromedusae.
What is a medusoid form?
A medusoid is a Cnidarians:An invertebrate of the phylum Cnidaria (formerly Coelenterata)Coelenterates include the hydra, jellyfishes, sea anemones, and coralsThe medusoid is one of the 2 forms, the other is the polyp.having a saclike body with a single opening (mouth), which occurs in polyp and medusa forms.
Is a free swimming form of a cnidarian called a polyp?
No, a free swimming form of a cnidarian is called a medusa. Polyps are typically attached to a substrate and have a cylindrical body with a mouth surrounded by tentacles at one end. Medusae have a bell-shaped body with tentacles hanging down.
Does a polyp have fluid in it?
No, a polyp is a growth of tissue and does not contain fluid. If there is any fluid associated with a polyp, it is typically due to inflammation or other underlying conditions.
What is the relationship between a stationary polyp and free swimming medusa?
Some cnidarians have a life cyce wih an alternation of generations between asexual reproduction and sexual reproduction; while asexual reproduction provides a large increasing of (identical) individuals, sexual reproduction mantain a genetic pool variety.The generation supposed to reproduce asexually is polypoid; the generation supposed to reproduce sexually is medusoid.Tipically, medusae produce male and female gametes, which fuse together making zygotes; a zygote becames an egg from which hatches a free swimming larva called planula; the planula reaches the sea floor and developes into a polyp; the polyp then becames a strobila (segmented polyp), wich reproduces asexually by strobilation, segmenting itself and producing many ephyras, which can be released one at a time or all together at the same time; each ephyra maturates into an adult medusa, reaching the reproductive maturity.
How do polyps differ from Medusas?
In organisms that exhibit both forms, the polyp is the asexual stage and the Medusa the sexual stage. In such organisms the polyp, by budding, gives rise to Medusa, which either detach themselves and swim away or remain permanently attached to the polyp. The Medusa then produce new polyps by sexual reproduction. A Medusa produces eggs or sperm, which are usually shed into the water; when an egg is fertilized, it develops into a swimming larva, which eventually settles and grows into a polyp. In addition to this elaborate means of reproduction, the polyp can form new polyps by budding. In some groups of coelenterates either the polyp or the Medusa has become highly developed, with the reduction or complete loss of the other form. Where only the Medusa occurs, as in many jellyfish, the larva never settles, and grows directly into a Medusa. Where only the polyp exists, as in the hydra and the sea anemone, the organism has the ability to produce new polyps sexually, as well as by budding.
What is the mode of reproduction of medusae?
Medusa is a stage in life cycle of Cnidarians eg. Obelia in which medusae are produced by budding in blastostyl.Medusa possess sex organs i.e. testes and ovaries which produce gametes i.e. sperms and eggs which fuse to form zygote which develops in second stage of life cycle called a Polyp . Possession of two alternating stage in life cycle of Cnidarians is called Metagenesis .
What is metagenesis in coelentrates?
Metagenesis, also known as alternation of generations, is a reproductive phenomenon in cnidarians where individuals alternate between a polyp and medusa form throughout their life cycle. The polyp form is a sessile, cylindrical structure that reproduces asexually, while the medusa form is a free-swimming, bell-shaped structure that reproduces sexually. This alternating life cycle allows for genetic diversity and adaptation to different environmental conditions.
